﻿<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="template" content="OPCFMasterPage.htt" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="rh-authors" content="Nathan Pocock" />
<meta name="topic-check-list" content="Ran Smart Index" />
<meta name="generator" content="Adobe RoboHelp 9" />
<title>HAClientOverview</title>
<link rel="StyleSheet" href="default.css" type="text/css" />
</head>

<body>
<h1>Historical Data Client Overview</h1>
<p>The Historical Data Client is a purpose-built client that demonstrates 
 the use of Historical Data as described in <a href="http://www.opcfoundation.org/ua/part11"><?rh-udv_start 
	 name="UaSpec11" ?>UA Specifications Part 11 - Historical Access (http://www.opcfoundation.org/ua/part11)<?rh-udv_end ?></a>.</p>
<h2>User Interface</h2>
<p class="Picture"><img src="image87.gif" alt="" style="border: none;" 
						 border="0" /></p>
<h2>Screen Elements</h2>
<table style="border-collapse: separate; border-collapse: separate;" cellspacing="0" 
		 width="100%" border="1">
	<col style="width: 23.705%;" />
	<col style="width: 76.295%;" />
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Menus</span></p></td>
		<td style="vertical-align: Top;"><ul type="disc">
			<li><p><span style="font-weight: bold;">File</span></p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Exit:</span> Quit 
				 the application</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">Server</span>:</p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Discover</span>: 
				 See <a href="UaGenericClientDiscovery.htm">UA Discovery</a>.</p></li>
				<li><p><span style="font-weight: bold;">Connect</span>: 
				 Connects to the currently selected endpoint.</p></li>
				<li><p><span style="font-weight: bold;">Disconnect</span>: 
				 Disconnects from a Server (if connected).</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">Aggregates</span>:</p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Enable Subscription</span>: 
				 Checked means the subscription is active; unchecked will 
				 disable the subscription.</p></li>
				<li><p><span style="font-weight: bold;">Select Variable</span>: 
				 Opens a node browser dialog that will modify the NodeId 
				 shown in the &quot;Variable&quot; field.</p></li>
				<li><p><span style="font-weight: bold;">Select Aggregate 
				 Type</span>: Not implemented.</p></li>
				<li><p><span style="font-weight: bold;">View Historical 
				 Configuration</span>: Described below.</p></li>
				<li><p><span style="font-weight: bold;">Modify Aggregate 
				 Filter</span>: Not implemented.</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">Help</span>: </p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Contents</span>: 
				 Launches this help documentation.</p></li>
			</ul>
		</ul></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Banner</span></p></td>
		<td style="vertical-align: Top;"><p>Shows the OPC Foundation logo 
		 and a [clickable] link to the website, shows the application name 
		 in large text, and shows the Certification logo with a link for 
		 more information online.</p></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Endpoint Bar</span> (below banner)</p></td>
		<td style="vertical-align: Top;"><p class="Picture"><img src="image38.gif" 
		 alt="" style="border: none;" border="0" /></p>
		<p>There are 3 key areas in the endpoint bar: </p>
		<ul type="disc">
			<li><p><span style="font-weight: bold;">Endpoint Url</span><span>: 
			 the endpoint URL (of a Server) to connect to.</span></p></li>
			<li><p><span style="font-weight: bold;">Use Security</span><span>: 
			 (checkbox) if checked will use a secure session, if unchecked 
			 then will use a raw/insecure session.</span></p></li>
			<li><p><span style="font-weight: bold;">Connect button</span><span>:</span> 
			 clicking this will attempt to connect to the specified endpoint.</p></li>
		</ul></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Settings</span> (left)</p></td>
		<td style="vertical-align: Top;"><p class="Picture"><img src="image88.gif" 
		 alt="" style="border: none;" border="0" /></p>
		<p>The settings allow you to specify the node which you will query 
		 for history, along with other parameters including the start and 
		 end times, and any statistical functions (aggregates) such as 
		 min, max, average etc.</p></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Data Value Display</span> (right)</p></td>
		<td style="vertical-align: Top;"><p class="Picture"><img src="image89.gif" 
		 alt="" style="border: none;" border="0" /></p>
		<p>This area will display the historical data returned by the UA 
		 Server that it determined matched your search criteria.</p></td>
	</tr>
</table>
<h3>View Historical Configuration</h3>
<p>The following dialog shows the current configuration in read-only dialog.</p>
<p class="Picture"><img src="image90.gif" alt="" style="border: none;" 
						 border="0" /></p>
<p><a href="HaData_Client_Aggregates.htm">Using aggregates to query data</a>.</p>
</body>
</html>
